Analyzing the Electrochemical Properties about Artificially Degraded Structure of NCM Cathode

This study aims to imitate the artificial structural degradation of a LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode and the electrochemical data for the analysis of spent batteries. Degraded NCM622 was obtained by controlling the charging cut off voltage, and the structural degradation was investigated using X-ray diffraction and inductively coupled plasma optical emission spectrometry. X-ray photoelectron spectroscopy results confirmed the cathode electrolyte interface on the surface of the electrode. Galvanostatic charge/discharge tests were performed using a cell with an overcharged NCM622 cathode, fresh anode, and fresh electrolyte to investigate the structural degradation effect on the cathode. The capacity of the higher overcharged electrode decreased with the higher IR drop and concentration polarization. This study demonstrates that structural degradation results in different discharge behaviors in lithium-ion batteries.